Since the JBL is being discussed I thought I would post this question again...I swapped a Mustang head unit and CD Player in my '91 SHO but I only get audio when the key is in the 'acc' or forward position. Audio is lost once the engine is started. I have checked all wiring and can't find any problems. Could this be in the ignition switch? Thanks in advance!! Jeff '91 SHO+ (stock)